Process of and apparatus for generating steam



July 9, 1935. 2,007,540

PRQCESS OF AND APPARATUS FOR GENERATING STEAM w. D. LA MONT Filed Aug. 10, 1951 5 Sheets-Sheet 2 VIII 4 rill/19 4 Am INVENTOR,-

.MLTEK Douala: No/v7 IAT1 'ORNEY 4 .W ffi m y 1935. w. D. LA MONT' 2,007,540

PROCESS OF AND APPARATUS FOR GENERATING STEAM Filed Aug. 10, 1931-. sweets-sheet s 7 61-014 uFF awk arf o INVENTCR Mum Douala 1w Npur -BY" ATTORNEY UNITE-D STATES PATENT] OFFICE 2,001,540' raoonss or AND arrana'rns 'roa" GENERATING s'rem Waiter noulu La Mont, North Colebrook, Coma, assllnor to La Mont Corporation, New York,

" .N..Y., [corporation or New York Application August 10,1931, Serial No. new

lnGermanynecemberztJm nis invention relates t'o-an apparatus for gento in a heat chamber. The steam generation lng steam' and particularly-to a steam senor-- within the tube istheretore extremely rapid and in which there is a positive and controlled the volume at steam formed, being many times iiy of water to the steam generating; elements. the volumeoi! the water irom which it is evapinvention' relates more especially'to steam or d, pies a l me part 01 the space within t :rators'in-which the heat for steam zenera-v the As no provision has been made in is received by the elements in part under the such conventional arrangements for the easy on or radiant heat in a heat chambe'r and 111' 1 W S m t l l the t a d ts ll er- ;-under the action or the heatot heating gas' rupted discharge therefrom and as it must travel 111g moreover, v upward through the tube and against the water eat chambers and furnaces of all typesg-both which tends 'to remain in the tube under the hythe combustion or tuel therein and tor-the draulic pres-mire oi the water level of the boiler, inement of heat delivered thereinto by hot e Steam in its p d 811181151011 te ds to force s or other materials orproduced' b'y-electric the water from the tube morerap y than the us, have heretofore presented'serious probconvection action described can deliver the water l of heat insulation and protection of the cone to the lower end of the .tube. The result is that 1g walls from the action of the gases or other the inner surfa es of the u may be left uncoverials 01- high temperature and from the defi d w wat r. overheating oi the metal upon irating action 01' the radiant heat present or which the radiant heat continues to fall may then ved in the iurnacei Especially iniurnaees' occur. a ima up u of the tube'wiii re ',tructd in gonngcflon withgteam generators 811R. .In addition, the solids contained in the :he combustion of fuel to provide the heat for Water e deposited up n'the tube surface and m generation, attempts have been made y b e dried thereon and thereby assist the m r to provide pmtection the rfmtoi-y burning action. Moreover, no special attention -1 1 1 m t confining-walls and t has beenheretoiore given to the relation of the greusuafly made either by th building mm flow oi 'water through the parts of the boiler walls-themselves or by the placement adiawhich a e Subjected to radiant heat in relation to the wall butwithin-the furnace, so as to to the-flow 0! Water through the parts which 1 t 1 from t direct a t 1 th absorb heat from the heating gases and certain heat. water tubes'and especially t b advantages which it is possible to obtain with at lected to the water space of the boiler with certain 3 8 1 steam generating. purpose-of providing circulation olsthe water ments in relation to these two sources of heat nigh i t e sum i t e permit steam have not been realized. All these conditions set :ration within the tubes. such tubes have limitations upon t -cap citajfiexibflit or oper- Mfore been arranged in t convenflonav ation, safety and emciency of steam generation I t the intention and purpose r permitunder radiant heat'in the so-called water wall or the so-called convection action of the heated Water will 31011913 the mixture of m and, t -w t It has been attempted heretofore to meet some he t t produce circulatkm ()1 t of these conditions in so-called convection cir- Iugh the tube, which water is'drawn from-the whit-1011 boilers by inserting pr twheels or 40 :r space of the boiler through suitable c n devices to induce a flow 01' water in the desired ions exterior to the heat chamber and the direction and .pflmp have been variously a1- :ed water or mixture of and water is ranged with the purpose of producing the proper n delivered to the water space oi the boiler. flow throueh'tubes 'p e o radiant heat. In

hile the aim and purpose of sucli arrangeall these. however, the problem presented due tohi have been tofprovide anjadequate cincuiathe diii'erent conditions of steam, generation in '0! water through the tubes subjected to radiflerent tubes or at diflerent points in'the same i it heat, it has been found that the severe contube or in diflerent sections of the boiler or of ms under which steam is generated'in such the steam generating apparatus has not been ngements has prevented the securing oi appreciated;

lfif delivery or water to the tubes and circu- It is, thereforebroadly the object of the presn oi! water therethrough. These severe 0011- cut invention to provide for operation of water axis are for the most part caused by the exwalls'and for generating steam by use of radiant iely high rate at which radiant heat is re-' heat-in such away as properly to meet these coned by the-surface of the thereditions-and to provide for steady and continuous steam generated in'said parts or to the conditions circulation of the water through the water passages or tubes of the water wall or water wall boiler. The combination or such water walls'or radiant heat absorbing surfaces with steam generating surfaces exposed to the heat of heating gases constitutes more particularly one or theimportant objects 0! the present invention. A}

It is aiurther object; or the invention-to provide ior the proper flow 0! water through different or. through separate parts oi the steamgenerating apparatus and in such relation to the of steam generation-therein that an adequate new or water may be maintained througheach part and in suitable relation in one part relative totheother. Itis a still iurther object of the invention to provide for control oi the amount .otwater deliveredto or flowin'gthrough thediflerent parts I and to control theiconditions under which'it flows so as to accomplish the properdeliveryto and flow through thediiferent parts of the steam gen-- erating pp atus to suit thg to! generation in said part3.

In my co pending application t or U.. S. ream Patent Serial No. 77,818, flledDec'ember 26,1925,

or which application the present application is.

a continuation in part, and in myco-pending application. for U. 5. Letters Patent Serial No. 530,228, ijlled April 15, 1931,- which, application also is a'division and a continuation in part of said application Serial No. 717,816, filed-December 26,

1925.11 have disclosed. andclaimed broadly the process of generating steam and the apparatus, for carrying out said process in which the water for steam generation is positively delivered into heat exchanging relation with a source of radiant heat in a plurality oi paths 0!. water ilow and in which the water is apportioned in the several paths in proper relation tothe steam generating conditions under radiant heat towhich his subs .iected in flowing in-said paths. The presentapplication is concerned withthe process of geu crating steam and the, apparatus Eior carrying out i the process which utilizes the features or said applications Serial No. '(7,816 and Serial No.

. 530,228, but is more especially concerned with the application of these processes and the utilization or this apparatus in the manner embodying tea-.

tures more specifically disclosed in my prior applicatlon Serial 110.17.816.-

In my prior s. Reissue IettersPatent 1s,s9s I have disclosed. a stearn'generator in which the waterto be converted into steam is introduced into the upper end of a steam generatingtube -in quantity greater. than can be converted into steam inits passage through the tube but less than suiiicient to tend to fill the cross section or the tube as it gravitates through the tube, both the water and the steam being .discharged'irom the lower end. or the tube and provision being made outside thetube for separating the steam and the water and continuouslyreturning the separated water to the upper .en'd'ot-the tube.

. In the construction disclosed inl'said Reissue Let-'- ters Patentigravity is employed as the-primary (orce to'cause theflow otwater through the steam generating tube and cause a fllm ot water to .b extended upon the inner surface ot'the tube the' outer suri'acebeing exposed to the steam generat- In my application for U. B. Letters Patent Serial No. 209,024, filed July 28, 1927.1 have disclosed a method of steamgeneration in which the ad- ?vantagesobtained by the method oi steam gen-" oration and the steam generator construction described in said reissue Letters Patent can also be obtained with a steam generating tube in which water must now through at least a part thereof without the aid of or gravity. To carry out the steam generating process in such a am erator with tubes aoarranged, I provide a continuous unidirectional movement 01 steam and water through; the tube-toward a common discharge end byan adjustment; inrelation to the generated in the tube. of the rate or delivery of water to the tube under the action or a i'orcing means,

I suchas a'pump, and byprovidinga tube of such diameter or internal cross sectional area in relation to and rate ofsteam generation and'said'rate or water delivery that-while space is lett tor'the thereof,- without interterencewithjthe steam ilow I have iound that stem generating "er I elements or the ty'pefo! my prior Patent 16,895.

and of the type disclosed inlsaid application Serial No. 209,024 m se used with particular;

advantage when exposed to radiant heat for protectionfof-jwafls otjlurnaces and for the purpose of steam generation; .However, I havediscovered that special conditions must be taken into account in the use of tubes when generating steam- I under the action .or' radiant heat... The present.

invention broadly is concerned with provisions T rormeeting these special conditions and more par} ticularly is concerned with meeting them in com-1 I bination-with the conditions or steamgenerating i under the action or theheah ot' heating gases.

especially in tubes or elements w i have their 7 extent in such relation to the two sources of.

heat that the now of water is successively over suri aoes subjected to'oneand then theother sourceor heat. Moreover, I have dis-. covered novel provisions are capable oi practical application whether. tubes or the type of my prior Patent 16,895 or those-o1- my applica- I tion Serial No..2 09,02 4 be used or whether steam generating tubes beoperated in the manner of so-called -Iu1l" tubes.

s. IulP' tube, in in -which the ex pression full .has been applied by me to steam generating tubes, may be defined-as a tube in" which thejamount oi -water present (inthe tube inrelation .to the amount of steam generated therein) is not sovlimited that the waterdoes not j.

occupy-a large part or the space within, or o! the cross sectional area or, the .tubeor is not so limited as not" to produce "fhydraulic" reaction within the tube. Full tubesi; thereiorefimay be said to be tubes inwhich the water'occupies alarge space within'the tube andthe-steammay be said to, be 'dispersedjin the water rather than that the water is dispersed in the steam as inthe tubes .of ,my priorpatent and application. Fu1l-- tubes mayjreceive the water to be'evapoirated by the. so-called {convection circulation mentioned above; or the water maybe delivered thereto by a positive means "such as a pump-or under-the j pressure oi! ahead oi watertoca'use the how of water into thetubes. The present-invention is concerned only with positive delivery or the water.

but-tubes operating in the various'gradations within'thescopeol the-invention 1 The conditions or. steam- .i'rom full? tubes to "film". tubes, 1. 6,, 1658 thantull", inclusive, are contemplated asbeih JOUID HEATER radiant heat referred to are in part due to the large volume of steam rapidly generated within the tube subjected to radiant heat and in part due to'the resistance to flow of water and steam through the tube and in many cases to the resistance offered to the flow of water due to gravity when the water must run upward through the tube or connections therefrom to reach the steam and water separating space. The large volume of steam, which in some cases in practice may be as much as 200 times the volume of the water from which it is evaporated, tends to expand within the tube and thereby displace the water in the tube, i. e., to "gulp" it therefrom, and thus prevent the entrance of water thereinto. Furthermore, the flowof steam through the tube requires a pressure drop and there is thus set up a resistance or back pressure to the entrance of water into the tube. The flow of water through the tube similarly requires the expenditure of force to overcome resistance, which force acts against the entrance of water into the tube. Such forces, therefore, prevent the proper delivery of water to the tube'and its flow therethrough unless suitable provision is made for positive delivery of the water to the tube and for forcing it into the tube and, unless the quantity entering each tube is properly controlled in relation to the conditions of steam generation in the while offering the advantage that the water retube.

Whether tubes of the type of my prior patent Re. 16,895 or of my application Serial No. 209,024 be used or whether "full" tubes be used, the tubes receiving radiant heat may be subjected to different degrees of the radiant heat because of their positions within the heat chamber or furnace ortheir positions in relation to the source of heat or because of other conditions. It therefore becomes necessary properly to control the delivery of the water into each tube so that an adequate amount of water will be delivered in relation to the steam generated in the tube and under such pressure at the inlet end of thetube that the "backpressure and the resistances mentioned above will be overcome and the flow of water through the tube and its flow in contact with the heating surfaces thereof will be continuously maintained so asto keep the tube surfaces wet and thus prevent burning.

Moreover, when tubes receiving radiant heat are operated in connection with steam generating surfaces absorbing heat from heating gas or when such tubes individually are subjected to both radiant heat and the heat of heating gases it becomes necessary or of advantage so to relate the flow of water to and over the surfaces or over the portions of the tubes subjected respectively to the heat of the different sources as to insure for each surface or for each portion of the tube so subjected a proper or an adequate amount of water. The insuring of this relationship of the water flow to the heat to which it is sub-' jected may be facilitated when the flow of the water is in series over the surfaces subjected to the heat from the different sources. When water in excess of the steam generation is delivered to such surface or to such tubes, the excess water passing out of heat exchanging relation with one source of heat may be delivered into heat exchanging relation with'the other source of heat. With such arrangements it is possible to combine the water delivered to the surface subjected to one source of heat with the water to be subjected to the other source of heat.

bijdi'illi mom meet the structural conditions of the furnace as well as other conditions, such as the impingement of the fuel or of the gases upon the wall of the furnace or upon the tubes, various sizes of tubes both as to diameter and as to length may be required and that tubes of various wall thickness may be used for different operating steam pressures or for proper mechanical strength or to provide a proper amount of material for stiffness or mechanical wear or abrasion. Such differences in dimensions in themselves may cause differences in the amountof heat absorbed by the tubes as well as in the resistances and other conditions of steam generation within the tubes.

While the selection of the particular size of tube and its arrangement within the furnace is within the skill of the engineer, my invention provides for the apportionment of the waterv to the various tubes or to the various portions of the heating surface or to units of heating surface or sets of tubes in accordance with the steam generating conditions to which said tubes or surfaces or units or sections are subjected.

Moreover, in the utilization of tubes of such length as to extend through the furnace or along the walls thereof and into a gas passage leading from such a furnace, whereby such tubes are subjected to radiant heat as well as to the heat of the heating gases passing from the furnace,

quired for steam generation in both portions of the tube may be supplied through one end of the tube and thereby may be in quantity in excess of the steam generation in at least one of the portions of the tube and preferably-in excess of the steam generation in both portions thereof, which feature is one of the features of the invention of the present application, the apportionment of the water to such tubes or the control of the delivery of the water thereto is of advantage in insuring the proper operation of the tubes and preventing the burning of the heating surface as above described.

In the utilization of steam generators having the heating surface thereof divided into separate parts and in which some of said parts are sub- :Jected to radiant heat and others are subjected to the heat of heatinggases, the water delivered to one of the parts of the steam generating surface may be delivered thereto in excess of the steam generated on said surfaces or in excess of the steam generated in the steam generating apparatus and the excess water discharged from said part of the steam generating surface may be delivered to another of said parts' of the steam generating surface. The water delivered to said parts of the steam generating surface, including the excess water delivered from one to the other, may be caused to flow over the steam generating surface and may be advantageously apportioned to said parts in the manner described above properly to supply the parts of the steam generating surface with the water for steam generation. Moreover, I have found that a control of the amounts of water delivered to said parts of the steam generating surface may be effected by suitably relating the amount of water delivered to one of said parts of the steam generating surface to the excess water delivered from said 'part of said surface to another part of said steam generating-surface or to the steam generated in said other part. Other relations of the water delivery to' the separate parts of the steam generating surface will be understood from the more In the preferred embodiment of this invention I utilize tubes of the type described in my prior Patent 16,895 or of the type disclosed in my copending application Serial No. 209,024. However, in the steam generators of the present invention, including the s o-called water walls and water wall boilers having tubes for the genera-- -tion of steam in connection with a combustion chamber and including steam generators having tubes for absorbing the heat of heating gases, and especially in the combinations of these two types of steam generators which form one of the principal features of the invention of the present application, whether using the tubes of my prior are important to properly supply all the steamgenerating surfaces with water to maintain the steam generation and to prevent the surfaces from becoming dry with consequent burning and rupture.

In the above and following discussions. reference is made to delivery to the tubes or heating surface of a proper or "suitable or adequate amount of water in excess of the-steam generating capacity of the tube or heating surface. By these terms is meant an amount or quantity of water which while in said excess relation is, however, so limited or controlled that .whether the tube or heating surface element is operating as a full tube or film tube" there will be no substantial gulping of the water from the tube with the result that the surface thereof is left dry and subject to the possibility of burning.

In applying the broad principle of the invention, while other means such as disclosed hereafter in connection with this invention may be used. I have found it advantageous in many cases to utilize an orifice at the entrance to each tube through which the water is caused to flow and thus to measure the amount of water entering .each tube so as to. deliver into each tube such an amount of water in relation to the total amount of water delivered to all the tubes that each tube receives its proper share of the water. In the use of the orifice or other restricting means it is also possible to provide such a pressure drop therethrough under the action ofthe. positive circulating means, for example a pump, that the back pressure created within the tube and the other resistances acting against the flow of water into the tube may be overcome and the continuous supply of water in the desired amount may be maintained. The orifices which I may use in the presentinvent'ion may be similar to those disclosed in my prior patent and application. While in said patent and application the function of these orifices is to limit the water sothat the tube will receive an amount of water less than suflicient to fill it, the function of the orince or an equivalent means in the present invention may be to properly apportion to the respective tubes, to which the water is delivered in parallel, such an amount of water in relation to the total amount of water so delivered that each tube will receive its proper proportion of the water in relation to the steani generated and with due consideration for the particular steam generating conditions within=the tube. when,

ered to the respective tubes.

therefore, tubes of the type of my prior patent or of my prior application hereinabove identified are utilized for steam generation under radiant heat conditions, as in the present invention, the orifice serves not only for limitingthe quantity of water delivered into the tubes to leave space for the steam but in relation to other similar orifices further serves to meter the water deliv- Thus there may be insured delivery to each tube oi a quantity of water in accordance with its conditions of steam generation and preferably in excess of its steam generatingcapacity .but less than suflicient to 1111 the internal cross sectional area thereof.

- It will be understood that my invention is not limited to a particular type of tube or to its method of operation nor to a particular place ment of tubesin respect to the heat falling thereon nor in respect to the direction of circulation of water therethrough. Since the'water is delivered positively to the heating surface or to the inlet ends of the tubes, the tubes may be placed in any position relative to the walls or to the source of heat or to the heating gases and may be bent to extend alongtwo or more walls or in any desired relation to other portions of the furnace or boiler structure and maybe bent to enter'the gas passage and extend therethrough. A proper delivery and apportionment of the water, preferably in excess of the steam generating capacity of the heatin'g'surface sub- Jected to the radiant heat and that subjected to the heat of the heating gases. is accomplished in accordance with the present invention. Preferably means such as orifices or other restricting means are used so that the positive delivery of the water to the tubes is effective to carrythe water into each tube or to each section of the heating surface in excess relation, which, orifices -may also'be used to limit the water entering the tube as above described.

When the heat distributicn in a heat cham bar is asymmetric so that certain walls or certainareas of walls or certain tubes or certain portions or units or the heating surface may receive-a much-greater amount of heat than other walls or areas or surfaces, an asymmetric arjrangement of water tubes or an asymmetric operation of these tubes or surfaces, or both, in the manner described in my co-pending application Serial No. 530.228 may be used, whereby the water circulation in quantity or velocity or both is to be apportioned according to the heat deliveredto the various portions of thewalls or heating surfaces. The circulation of the water. not only for the tubes subjected to radiant heat but for those absorbing heat from gases, may be enected from .a single water circulating means such as a pump. or a plurality of pumps may be used and suitable arrangements of pipes and connections may be provided to deliver the water to vthe respective tubes orheating surfaces or to the separate parts thereof. Control 01' the I water delivered to the various portions of the Various arrangements and modifications may be made within the spirit of the invention and those shown in the drawingsa'nd the more detailed description to iollow merely typical. They illustrate some of the many possible come binations included within the scope o1 the invention and in no sense are to'be taken as limiting the invention.

- Fig. 1 is a diatic section through. a iurnace having tubes adjacent its walls and a boiler ior absorbing the heat 01 the gases from the furnace. I i u Fig. 2 is a diagrammaticsectionoi a combination of a furnace having=tubcs arranged to absorb radiant heat and bent to form a bundle of tubes to absorb'the heat of the gases irom the iurnace.

Fig. 3 is a diagrammatic section through a structure comprising a boiler'ot commontype and a furnace havlngtubes for absorbing radiant heat arranged according'to the present invention. v I

Fig. 4 is a cross section of a part of a water inlet header to which are connected tubes pro- ,videdwith water inlet orifices. a

Figure 5 shows in section a typical arrangement or the tubes in the radiant heat zone.

Fig. 1 shows a iurnace in which tubes for steam generation are arranged in-relation to the walls of the furnace for absorption 0! the radiant heat produced by the combustion 'oi ruel within the furnace. The i'urnace walls are'shown at land the fuel burner at 2. Two sets or layers oi. steam generating tubes are shown, one layer beingembedded in a lining upon theiurnace wall. Thetubes l are shown just inside and against the wall of the furnace, while the tubes l. are shown arranged behind the'tubes I and within the lining upon the wall. "The arrangement of the tubes in relation to the wall and in relation to each other may be varied tonieet diflerent conditions. Connected. to the tubes at their upper ends are water inlet headers it. 'At their lower ends the .tubes are connected to headers 23 irom which the steam generated within the tube is discharged together with any ex cess water. a A steam and water separator 6, connected by suitable pipes' to'the Jowe'r'headers,

' receives the steam and water discharged from the by the pump II and forced through the pipe iii.

to the upper headers 83; preferably in quantity in excess of theevaporatlon within the tubes 3 and I and in the tubes ".the excess water from the tubes Bil being delivered to" the tubes 'voir 8 as described above.

Provision is made, in accordance with 1 present invention, to deliver water. to these 'diii Ie'rent layers or sets of 'tubes and to the different sections in accordance with the amountoi steam'generated therein. The pump delivers water in quantity in excess of the steam generating cap'acity'ot the steam generating-apparatus and in accordanc'e with the invention this water may be delivered and 'apportioned'to the different setsoi' tubes or the. difierent sections in quantity in excessxoi the steam generated in each tube .or section. The diflerent'co'nditions' of back pressure and resistance and the different amounts of steam generated in the diflerent tubes and in the dii'ierent sets. sections or parts of the apparatus may ther'eiore be adequately provided for.

. Water walls may be combined with various types of boilers 01 which two types 01' water tube boilersare shown in Figs. 1 and 3 and a combined .i llm tube boiler and water..wall is shown'in Fig. 2; Various water circulation combinations may be employed and only a few are illustrated' inthe drawings. The arrangement of the tubes and sections or parts or the heatfiring mechanism or other conditions.

. More specifically Fig.1 illustrates a film tube Patent Re. 16,895,; A's described above, the water wall construction is provided-with headers- II and 28; connected by tubes 3 and I, the am tube steam generator is similarly provided with headers 83 and 84 connected by tubes 80. The water level in the lowcr'header 84 is controlled bylevel control I which cpntrolsieed water input by the valve 82 in series with the controlvalve -|'l operated by the level control I. As the lower header 8] of the steam generator is connected to the upper header ll of the water well boiler and 'the'water circulation -pipe it connects to the'upper headers 83 ot the'steam generator, the water circulation is in series, first through the steamgenerator and then through the water wall boiler. Steam is separated in the lower header N and passed out through the pipe water wall boiler. passes; out through the pipe 'water" wall" boiler combined. with a film tube steam generator 01- the type described in my as. I! controlled by the valve 8!. Steam tromthe 2| or the-pipe Zilaas described above. -A'bypass pipe'li-is provided in crderto cause water from the lower header II to be bypassed around the waterwall boiler when the water in excess of the evaporation in the steam generator is too greatly in excess of that of the water wall boiler.

In Fig.4 is shown a plug inserted in a tube pro-'- viding one 01 the *jet orifices which are utilized qto produce. an evendistrlbution or apportionment oi 'the water or to'torm a mm on the insideot the'tubes as-described above; The plug "provided with the small orifice I! is merely an illustration of a number oi types of orifices which can be embodied in headerfconstructions suitable, iorjthe present imzention and in no sense'limits' the invention to the constructions and let arrangements shown. I

Figure 5 shows a cross section transversely of the lengths r the tubes 1 or no in the radiant heat zone. In thisilgure the tubes. are shown relatively closely spaced in the direction parallel to the furnacelwall I. As in Figure 2, a refractoryj covering'may'. be placed on the Iumace side of 3 and 4 and being again discharged to-the reserthe tubes. The section shown in Figure 5 may be taken as typicaloi the arrangement or the alow water level control In which operates thevalve I31 in the bypass pipe l30 which bypasses waterirom the upper header}! to the lower .header. -When Ithewater wall boiler takes water iromgtheheader 81 faster than water is supplied .to'the header-in the normal series circulation, the waterlevel will fall and when it falls below the level of the control I82,- the. valve Iii w'ill'be opened and sumcient water "will be bypassed to The invention has been described and in detail inconnection with water walls and boilers using water asthe cooling agent and steam controlled. Such amounts may be in excess of the amount of steam generated in the water wall andifthe flow oi the wateris inseries'through the boiler and the wall the amount 'deliveredto' vice I constitutes a means of controlling the flow of the. water to one part of the steam generating apparatus from another part thereof in accordanee with variations in a condition of the water flow inthe circulation of the water. This condition ofthe water ilow may bethat o1 theseries" circulation through the two parts-.0! the. steam generating apparatus or may control the flow or the water flowing in seriesbetween the cularly generating material. The invention is, however, in no sense limited to the-useo! water and any other suitable liquid may be used. The inven tion has been described in connection with (11-; agrammatic drawings which show the principle the water to flow lmi-direetionally through the of the invention applied to several typm of boilers. In any Particular installation, or course, the structural features must be adapted to the installation' and-to the operating conditions and the various commonly used accessories such as water purifiers, various types of iced water injector .pumps or steam injectors. and the like, may be.

necessary or advantageous in some cases and it is not intended that the invention should be considered as limited to the diatic or skeleton boiler shown, but on the contrary, it will be clear to those skilled in the art that in installing water walls and boilers embodying the present invention, the usual arrangement and installationstructure is to .be followed in accordance with the best steam engineering practice.

'rality of steam generating tubes surrounding said furnace to absorb the radiant heat thereof and extending into said gas passage to form a-bun-'-' The principles of the present invention; how.- ever, may be applied in various modifications which willibe clear to those skilled in the art I stricting the delivery of water to said tube exand which areincluded inthe invention. 'Whatisclaimedis: A I

1. Steam generating apparatus comprising a furnace for-the combustion of fuel, 'a gas e connected to said furnace through which' the combustion gases from the furnace pass, s pludie of tubes to the heat of thegases-by convection, means'for positively effecting the delivery oi! water to one end of each or said tubes,

. i and means for insuring uni-directional now of the .oftubm to absorb the heat of the gases by-convection, means for positively delivering to the tubes at oneend thereof water in excess of the steam generated therein, and meians ,for apportioning the waterto the tubes-atsaid end and causing it to flow. unidirectionallythrough each tube in excess of the steam generated the ei under the action of both-radiant and convection heat.

therein a of tubes, means for delivering water to one end of said steam generating tubes;

means'ior the water to flow uni-directionally through the tubes towardthe'otherl'endthereof, and means for the steam generated in said tubes from said-other end thereof comprising walls forming a furnace for the combustion offmagasmconnectedwith saidfurnace through which the combustion gases from the furnace pass, a plurality of steani' generating tubesextendingalon'g'thewallof saidfurnace.

in parallel arrangement and passing into said ga's passage to form therein a bundle of tubes, means for delivering water to said steam generating tubes at the ends thereof in' the gas'passage remote from the fumace'.'and means for causing tubes and tube discharged from the other ends together withthe steam generated in said 5. Steam 'gene'rating' apparatus comprisinga steam generating tube exposed to the heat of heating gases, a generating tube exposed .to radiant heat of a furnace, means for dolivering water in excess of the steam generating capacity of the steam generating apparatus toone end of said-tube exposed to the heating gases,

means restricting the delivery of water to said tube exposed to heating gas to insure unidirectional-iiow of the steam and water through said tube, means for discharging from the other. end

i of said tube the steam generated therein together with the water in excess of said generated steam, means for delivering said excess water to one end of the tube exposed to radiant heat, means reflow of the steamand water -through "said tube,

means {or discharging from the other end of said heating gases, a steam generating tube exposed to the heat of a furnace, means for deliverlngto one end or one of said tubes water in excess-pf the steamgenerating capacity of the steam generating apparatus, means for discharging from the other end of said tube the steam generated therein together with the water in excess of said generated steam, means for delivering said excess water to one end of the other tube,

means associated with at least one of the tubes for limiting=the quantity of water delivered to tube exposed to radiant heat the steam generated, therein together with the water in excess of said said tube toan amountinsuflicient to fill the cross sectional area 'of said tube throughout any, substational portion oi'its length, means associated with. the other .of said tubes, restricting the amount of waterdeliveredv to the tube, said water limiting'and restricting means being constructed and arranged to insure unidirectional flow of the .water successively through said tubes and means I 1'or discharging i'rom said other tube the water amount insuiiicient to till the cross-sectional area of said tube throughout any substantial portionor its length, means for discharging from the .other end of said tube the steam generated there-E in together with the water in excess'oi' said generated steam, means for delivering saidexcess water to one end of the tube exposed to radiant heat;

means'at said end of said tube exposed to radiant heat for limiting the quantityoi water delivered to said tube to an amount insuflicient to fill the cross-sectionai area of said tube throughout any substantial portion or its length, means for discharging from the other end- 01' said tube exposed to radiant heat the steam generated therein together with the water in excess of said steam,

and means for returning to the water inlet end oi said tube exposed to the heat of the heating gases the excess water discharged from the tube exposed to the radiant heat.-

8. Steam generating apparatus having a or its steam generating surfaces exposed to the heat of heating gases and a part thereof ex- P sedto radiant heat, at least one of said parts being in the form of a plurality of steam gener ating elements, me'ans'ior positively'delivering .water to said-elements at least in' excess of the steam generatedin said elements. means for delivering said excess water. to the other part oisaid surfaces,;and means restricting the down! 'water throughthe parts a'rranged'with respect thereto to cause unidirectional flowoi the water both through said elements and through .said other part.

9. Steam generating apparatus having part of its steamgenerating surfaces exposed to the heat or heating gases and-a part thereoi exposed to-r'adiant heat, saidparts comprising a' plurality ofst'eam n rating elements, means for positively delivering to one o said parts water atleastfin excess or the steam generated in said part, means for causing the excess water from said part to flow through the other part,

means for restricting the flow of the. water through the elements'for causing unidirectional flow or the water therethrough to maintain flow in series through saidparts; and means for returning to the first part or the steam generating 'suriaces any excesst'water discharged from said other part. a

10. Steam generating apparatus having'a plurality -o1 continuous heating elements each 'ex- Posed in part to radiant heat and in part to the heat or heating gases, meanslior positively delivering. water to one end 01*:each element; means at said end or the elements for causing' the water to now 'unidirectionally through' the elements toward the other end thereof, said pos- .heat and the heat or the itive delivering means beingarrang'ed to deliver the water-in excess orthe' steam generated in' said elements under the'action'oi both radiant heating gases, I means adiacent said'part or said elements exposed to radiant heatto form sheet-confining fur a e wall, and means associated with the remaining part'ot said elements providing a heating gases to flow; therethrough.

11. Steam generating. apparatus having a p1u rality otcontinuous heating elements each expassage for posed in part to radiant heat and in part toihe heat or heating gases, means for positively delivering water to one endof each element in excess oi-the steam generated in said element, and means vassociated with said end or the elements for apportioning to and causing .to flow uni-directionally through the elements an amount or water in excess or the amount of steam generatedln the elements under the action of both .the radiant heat and" the heat or the heating 12. Steam' generating apparatus having a-plu- .rality of continuous heating elements each ex posed in part to radiant heat and in-part to the 'heat of heating gases, means for positively delivering water to one end oteach element-- in excess of the steam generated in said element.

and means associated with said end-of each ele-' ment for insuring the delive'ryto and flow through each element To! an amount 0! water in' excess or the amount 01" steam'generate'd in each element under the action oi both the radiant-heat and the heat-of thejheating'gases.

13. Steam generatingapparatus having a plurality or continuous heating elementa'each exposed in-part to radiant heat and in part to the heat oi heating gases, means for positively --delivering the water'toione end of each element in' excess of the steam generated in-said element,

and orifices at said end of each element Ior'de- -'liv e'rin ginto each "element such'a portion of the water delivered to saidends of the elements .as to flow through said element in excess of the steam generated therein under the action of both radiant heat and theheat elf-heating gases.-

14. Steam generating apparatus having -its steam generating surface arranged in a plurality 01 separate parts, one of said parts being exposed to the heat-of heating gases and another oi said parts being exposed to radiantheat, means for positively delivering to one or 'said' parts water .in excess 01' the steam to-be generated therefrom in said apparatus-means tor-causing the excess water discharged from said part 01' the steam generating surface after-passage thereover to be delivered to and to flow over the other part oi.

the steam generating 'surface,and means restricting the delivery of thewater through each 01' said-parts to causethe 'water to tionaily through said partsin succession.

Y 15. Steam generating apparatus having its ;steam;generating surface arranged in a plurality of separate parts, one of said parts being exposed toradiant heat and another of said parts being exposed to the heat of heating gases, means ior. positively delivering water to one oi saidparts oi the steam generating surface andcausing it to flow thereover in excess of the. steam generated 1 said 'part or the steanigeherating suriaoe,

means tor-delivering saidexcess water to the other-part or said surtace. and means'restricting the delivery oi water through said parts so as succession.

16.-Btearn generating apparatus having its s'team generating sun-race arranged in separate parts. one part of said steam generating surface being arranged to absorb a considerable portion .01 the heat for steam generation underthe action or "radiant heat. means lor positively delivering water to the steam generatingsurface including to cause it to flow unidirectionally thereov er in:

- parts thereof unidirectionally and. inexccs's oi" the steam generated therefrom, said excess wameans restricting the delivery of the watersoas to cause it to flow successively over the -separate ter after passage over the separate parts of the steam generating surfacebelng discharged therefrom and returned-to its point of delivery to the steam generating surface,- I

17. Steam generating apparatus having-part of its steam generating surface exposed to the heat of the combustion gases from a furnace and part thereof exposed to the radiant heat of the furnace; means for delivering to the steam generatingsurface exposed to the heat of the combus- I tion g'ases water in excess of the steam generated;

V on said surface; means for delivering to the steam generating'surface-exposed to radiant heat the excess water discharged from said steam gen the heatof the heating gases from the furnace,

ranged with respect'to said parts so as to cause.

"Iii

-means for delivering water to one end of the part '01 .the steam generating surface exposed to the heat of the heating gases and causing it to flowthereover toward-the other end of said'part of said surface in excess of the steamgeneratedthereon, means for'deliverin'g at least apart 'of said excess water to one end ofthe part ofjthe steam generating surface exposed to radiantheat', andj'm'eans re'stricting the flow ofthe' water over said parts to cause it to flow thereover toward the other end of each part of said. surface-without return flow over said part. a

19. Steam generating apparatus having part oi -its steam generating surface exposed to radiant heat and partthereof, exposed to the heatof heating gases, means for-deliverin water to one of said parts of the steam generating surface in excess of the steam generated in the steam generating apparatus, means for delivering to the other part of said steam generating-surface and for causing to flow'thereover the water in excess (of the steam generated in said'part togwhichthe 'wateris first delivered; means for discharging from said other'p'art oi the steam. generating surfacethewaterin excess oithesteam generated on said part, means so restrictin'gthe how of water throughsaid parts as to prevent return flow in said parts and to insure'flow of the water successively through said parts, and means for -returningfto said part0! the heating. surface-t6" which the water isiirst delivered the excess waterdischarged from said other part of the heating-1 v o 1 .25. Steam generating apparatus having a part of its-steam generating surfaces exposed to the surface,

20. 'Steam heat of heating gases and a part thereof exposed to radiant heat, means for delivering water to "1 one of saidparts of the steam generating surface and causing it to flow therethrough in ex restricting the water flow through said' parts ar the water to new through said return flow in said parts;

2i. Process oigenerating steam "which/com parts without generating apparatus having part of its steam generating surface exposedto. the

in parallel paths and successively in ag iven order in heat exchanging relationto a source of. radi ant heat and to heating gases. said waterbeing caused to flow at least in excess of the steam generated therefrom while flowing in the'heat exchanging relation into which it is first delivered, and so restricting the flow of the water flowing in said heat exchanging relations as to insure that the water'is apportioned to the parallel paths and is caused to flow insaid paths filCCBSSlVClY in said order of heat exchange relaon.

22. Process of generating steam which comprises causing water to flow in heat exchangingrelation to a source of radiant heat'in a quantity in excess of the steam generated during said flow. causingwaten to flow in heat exchanging relationto heating gases in a quantity in excess of the steam-generated during said flow, delivering the excess water discharged from flowingin one of the heat exchanging relations to flow in the other heat exchanging "relation, and so restricting the flow of the water as itflows, in said heat exchanging relationsas to insure unidirectional flow of thewater in .each of said heat exchanging rela-- tions and successive new of the excess water through said heat exchanging relations.

23. Process of, generating stearnwhich compriss causing water in excess of the steam generated therefrom to flow successively in a given order-in heat exchanging-relation to a source of radiant heat and to a source of heat in the form of heating, gases, dividing the flow of the water so as to cause it. to flow in parallel paths while flowing in heat exchanging relation to each of said sources of heat, and-so restricting the flow of the'water as it flows in said heat exchanging relations as to apportion the water to said paral-- lel paths and to cause it to flow therein unidirectionally. and successively in said heat exchanging relations.

24. Process of generating steam. vwhichvco nrprises causing water in excess of the steam generated therefrom to flow in heat exchanging relationto a source oi radiant heat and to .a source of heat in the formof heating gase's causing at :1east a'pa rt of. the waterin excess of the steam generated during its flow in heat exchanging relation to'one-ofsaid sources of heat to be delivered into-and to iiow in heat exchanging relation to the othersource of heat, so restricting the amount of water-flowing in said heat exchangingrelations as to cause unidirectional flow thereof throughout said .heat exchanging relations and 'yarying the amount of water flowing in heat exchange relation to one source of. heat to vary the amount of water flowing in heat exchange relation to 'the other source of heat.

elements for causing uni-directional flow through a said elements oi water delivered thereto, and means for delivering'the water in excess of the steam generated in said part to said other part including meansarranged to restrict the flow of water in the'elements of saidother part so as to insure uni-directional flow through the elements of said other part.

26. Steam generating apparatus having part of its steam generating surfaces exposed to the heat. of heating gase'sand a-part. thereof exposed to radiant heat, said parts being composed of a plurality ct steam generating elements, means ior positively deliveringto one of said partswater at'least iii-excess oi the steam generatedin said part, means for causing said excess water from said part ,to flow through the other part, and means for restricting the flow oi the water through the'elements-i-ior causing unidirectional how of thewater therethrough to maintain flow in series through both said parts. I a

27. Process of generating steam which comprises deliverin'gwater into and sorestricting-the flow as to cause it to'ilow without return ilow in heat exchangingrelation to two, diiierent sources of heat, and so varying the amount 01 .waterdelivered into said heat-exchanging relations-that as the water delivered. to onecfisaid heat-exchanging relations isdecreased. the amount of waterdelivered to the' other heat exchanginglre-" lation is increased and-as the amount of the .water delivered to said first heat-exchanging relation --is inereasedthe amount of water delivered-to said 7 other heat exchanging relation is decreased;

28; Processor generating steam whicheom-.-

prises causing water to how successively ins-given order in heat exchanging relationto a source of v radiantheat and a source 01 heat in the form of heating gases and at'least in excess of -the steam generated therefrom while Iiowingin the heat exchanging relation into which it is first delivered, so restricting the flow of the water as it flowsin said heat exchange relations as to insure flow thereof successively insaid relations without return flow therein, and .varying the. amount of said-excess waterflowing from said first heat exchanging relation to said successive .heat exchanging relation to vary-the relation of.

the water quantities flowingchanging relations. -4 s v 29. Process .01 generating steam which com-e prises causing water to how successively in '-a given order in heat exchangingrelation to. a

in said heat exsource of radiant heat and to a source, oiheat in; the form of heating gases and in excess-ot-thesteam generated therefrom while flowing in at least one or said heat exchangingrelations, so restricting the flow oi the water as it flows in said I heat exchange relations as .to insureil'ow thereoi successively in said relations without'returnflow therein, and sovarying the amount oi water de-v livered intosaid heat exchanging relations that as the. water .delivered' to .one of said heat exchanging relations is decreased the amount of water delivered to the other heat exchanging re lation is increased and asthe amountot the'water delivered to. said-first heat exchanglngrelation is increased the amountoI-water delivered to "said other heat exchanging relation isdecreased.

a 30. Steam generator comprising a plurality-oi water tubes, means'ior positively deliveringwater.

to said tubes and'causing it to flow-in each .tube

toward one end thereof, said tubes each-having a part or its continuous length exposed to radiant heat and having a part or its length exposed to heating gases passing .thereover said parts ex 'posed to radiant heat being arranged in relatively close relation to intercept the radiant heat, each of said parts exposed to the gases being formed and being so arrangedin a-gas pasage -and with respect tothe other parts exposedtc the heating Iace and-to :deliver it.

gases as to provide a plurality oilike extending portions 01 said parts overiwhich aid Bases iiow inheat exchanging relation thereto, whereby the steam generated in eachtubeis generated from I water heated consecutivelyby radiant and conveca 31. Steam generator comprising a- 151mm tubes subjected tosteam generating heat, means cess of the steam generated in the steam genera .ior positively delivering water to'th'e tub m 10 torgme'ans for distributing thewater-to the tubes.v A

discharge and thereoi. said tubes being connected atgtheir outlet ends" toa steam and water separating space; each tube throughout its length subjected to-heat providing a single path 0! fluid now, each tube-having a part-,ot-its length exposed to radiant-heat and a part or its length exposedto the heat of seatin Bases, said parts exposed to radiant heat being-arranged in relaand causing'it to-flow in' each tube'toward the tively closely spaced relationvtoi'orm a heat intercepting water-wall, said tubes being bent relative to each other and relative to the parts erposed to the radiant heat to position said parts exposed-to heating gases in such'relation toieach' other as to providezior how ,0! theuheating gases thereover and to !orm,a..bundle of tubes .i.'orab sorption of heat from the ,gaseshy convection.

32. Steamgenerating. al Daratus having-fitsf steam generating surface divided into two parts,

means for delivering toone oi theparts otgthe generating surface water in excess; of the steamgeneratedthereon, means for delivering tothe :other part of said steam generating the. excess water discharged from said which the mater-is-iirstdelivered in said Y means restricting. the: waterllflo'qvthrough; said parts arranged withrespect to so as to cause the water-to flowithroughvsaid parts" withoutreturn flow in-said parts. means for by-passingraround at-least onej oithe steam e e ati atJeaat s me or the water deliveredithereto.

.. 33.- Steam. generatingapparatus steam generating surface-divided into two parta,

means for delivering-to .on'e'ot :thej' parts' oiithe steam generating surface waterin excess oithe 1 steam generated thereon, a means for delivering to the other; .pa'rtZoL-said steam generating surface the excess water from said I. to which the water isiirst deliveredinexcess, means restricting the water flow said parts arranged yith ,respect tosaid so as, to cause the water to flow through parts without return new in said parts," and means automatically controlled in accordance with .Vlflations' in theamcunt oi said excesamtfl dellvr ered from once! said parts-oigthefheating sue-.-

iace to the other toby-pass a portion i delivered to one of said parts of the heating cur-'- rectly theother part of said heating .34.- Bteam generating apparatus' having its steam generating surfaces divided into arateparts, means tordelivering tolonefot parts or the steam generating water in excess or the steamgeneratedthereon; means for delivering to the other part of said steam parts withouti'eturn iiowin saidparts; and means mated in, accordance withvarlations'fin the relation between the amount of water delivered to one of the parts 0! the steam generating surtace and the amount of stesm'generated in one of said parts to control the amount of water delievered t'o'one of said parts.

35. Steam generating apparatus having' its steam generating surface divided into separate parts, means for delivering water toeaoh of said parts so as to flow therethrough. means for delivering from one of said parts to the other any first mentioned part, means restricting the water flow through said parts arranged with respect to said parts so as to. cause the water to now through said parts without return flow in said parts, and means actuatedin accordance with a reduction in the amount oi'said excess water flowing from said first mentioned'part to theother part to deliver directly to said other part. water to maintain said delivery to said other part;

36. Steam generating apparatus having its steam generating surface divided into tw'osep- .arate parts, means-tor delivering water toe'ach of said parts so as to tiqwthere'throhgh, means for delivering from one '0! said parts to the other 1 1 part any water flowing through said first men- ..tioned part in excess of the. steam generated therein, means restricting the water flow through said parts arranged-with respect to said parts so as to cause'the water to' flow through said parts without return new in said parts. and means brought into operation by an increase in the amount of excess water delivered from said iirst mentioned part to said other part to limit the delivery 01' water to said other part. water in excess of the steam generated in said.

3?. A steam generating appartus having its steam generating suriaces divided into two separate parts,- means for circulating water in series throughsaid parts in a completely closed circuit including-said parts and in excess of the steam generated in the steam generating apparatus,

means restricting the water'iiow through said 'parts arranged with respect to said parts so as to cause the water to flow through saidparts without return flow in said parts, and means ac-.

tuated in accordance with variations in the amount of water passing from one part to another to control between predetermined limits WALTER nouanss La MONT. 5 

